Renesas HD4074019S

Overview

HD4074019S from Renesas Electronics is a CMOS 4-bit single-chip microcomputer with 16,384-word × 10-bit PROM, 992-digit × 4-bit RAM, 58 I/O pins (including 26 high-voltage outputs up to 40 V), two 8-bit timer/counters, and a clock-synchronous 8-bit serial interface - designed for direct fluorescent display driving in industrial control panels and legacy instrumentation.

For engineers reviewing the HD4074019S datasheet, HD4074019S pinout, HD4074019S application, or HD4074019S equivalent, this page delivers verified technical context, validated pin functions, confirmed operating voltage range (4.5–5.5 V), minimum instruction cycle time (0.89 µs), and real-world use cases in display-intensive embedded systems.

Technical Context

The HD4074019S implements a Harvard architecture with separate 10-bit PROM and 4-bit RAM address spaces, supporting bit-addressable I/O ports and mask-configurable pin circuit types (NMOS open-drain, PMOS open-drain, or CMOS). Its on-chip oscillator accepts crystal, ceramic resonator, or external clock inputs.

Interrupt handling uses priority-encoded vector addresses ($0002–$000C) with five sources: two external (INT0/INT1), two timer-based (Timer A/B), and one serial interface - all managed via dedicated RAM-mapped control bits ($000–$003) and stack-automated context save/restore (16-level LIFO).

Key Specifications

Pinout & Package

HD4074019S is supplied in a 64-pin shrink-type plastic DIP (package code DP-64S), with 0.4-inch body width and 0.1-inch pin pitch. Pin functions are fully defined per Renesas HD404019R Series Rev. 6.0 documentation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit microcontroller applications.

Compared with HD4074019S, HD404019R offers lower unit cost at scale but longer development lead time, while HD407L4019 trades slight speed reduction (1.12 µs min cycle) for broader supply flexibility - making HD4074019S optimal for 5 V-only, fast-turn prototyping.

Availability

HD4074019S is available at Aetrix Electronics and suitable for industrial control panels, legacy instrumentation displays, and factory automation status boards requiring stable component supply and long-term obsolescence management.

Supply support for HD4074019S includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for industrial, automotive, and infrastructure markets.

The HD4074019S belongs to the HMCS400-series 4-bit microcomputers - designed specifically for cost-sensitive, display-centric embedded applications where high-voltage I/O integration and deterministic real-time control are critical.

FAQ

What is the maximum operating voltage for HD4074019S high-voltage I/O pins?

The HD4074019S supports up to 40 V on designated high-voltage I/O pins (D4–D15, R0, R1, R2, RA). This rating applies only when Vdisp is properly connected and decoupled; exceeding 40 V risks permanent damage. The HD4074019S datasheet specifies these pins are intended for direct fluorescent display segment/anode drive, not general-purpose high-side switching.

Does HD4074019S support in-circuit programming or field firmware updates?

No, HD4074019S uses factory-programmed PROM (ZTAT™) and does not support in-circuit programming or field firmware updates. Firmware is permanently written during manufacturing; changes require ordering new devices. This differs from flash-based MCUs and aligns HD4074019S with fixed-function, high-reliability display controller roles.

What oscillator configurations are supported by HD4074019S?

HD4074019S supports crystal resonators (1–10 MHz), ceramic resonators, and external clock inputs via OSC1/OSC2 pins. Internal oscillator circuitry provides startup stabilization without external capacitors for crystals ≤ 4 MHz. The HD4074019S does not support RC oscillators or PLL-based frequency multiplication.

How many levels of subroutine nesting does HD4074019S support?

HD4074019S supports up to 16 levels of subroutine and interrupt nesting using its dedicated 64-digit stack area ($3C0–$3FF). Each level consumes 4 digits (16 bits) for PC, ST, and CA storage. Stack pointer (SP) is auto-decremented on CALL/INT and auto-incremented on RTN/RTNI; overflow beyond 16 levels causes undefined behavior.

Is HD4074019S RoHS compliant and lead-free?

Yes, HD4074019S meets EU RoHS Directive requirements and is manufactured as lead-free. Renesas confirms compliance in official product change notices and material declarations. For full environmental documentation, refer to Renesas' official HD4074019S product page or contact their customer support with the exact part number HD4074019S.